請求被中止無法在共享主機服務器C＃上創建ssl / tls安全通道

Question

我們無法使用webrequest或htmlagilitypack連接到https服務器它顯示以下錯誤

The underlying connection was closed: An unexpected error occurred on a receive.System.Net.WebException:或could not create SSL/TLS secure channel on server

我們的代碼在localhost上工作正常，我們還在我的代碼文件中添加了以下部分，但我們無法確定它僅在服務器上發生的原因。

ServicePointManager.Expect100Continue = true;

ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

如果有人對此有任何想法，請與我們分享。

Answer 1

有時這是因為webrequest不接受自簽名證書。 我有這個我經常使用的單身課程。 它接受所有自簽名證書。 如果您共享了您嘗試訪問的URL，則更容易確定是否存在更簡單的解決方案。

public sealed class Certificates
{
    private static Certificates instance = null;
    private static readonly object padlock = new object();

    Certificates()
    {
    }

    public static Certificates Instance
    {
        get
        {
            lock (padlock)
            {
                if (instance == null)
                {
                    instance = new Certificates();
                }
                return instance;
            }
        }
    }
    public void GetCertificatesAutomatically()
    {
        ServicePointManager.ServerCertificateValidationCallback +=
            new RemoteCertificateValidationCallback((sender, certificate, chain, policyErrors)
                => { return true; });
    }

    private static bool RemoteCertificateValidationCallback(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
    {
        //Return true if the server certificate is ok
        if (sslPolicyErrors == SslPolicyErrors.None)
            return true;

        bool acceptCertificate = true;
        string msg = "The server could not be validated for the following reason(s):\r\n";

        //The server did not present a certificate
        if ((sslPolicyErrors &
            SslPolicyErrors.RemoteCertificateNotAvailable) == SslPolicyErrors.RemoteCertificateNotAvailable)
        {
            msg = msg + "\r\n    -The server did not present a certificate.\r\n";
            acceptCertificate = false;
        }
        else
        {
            //The certificate does not match the server name
            if ((sslPolicyErrors &
                SslPolicyErrors.RemoteCertificateNameMismatch) == SslPolicyErrors.RemoteCertificateNameMismatch)
            {
                msg = msg + "\r\n    -The certificate name does not match the authenticated name.\r\n";
                acceptCertificate = false;
            }

            //There is some other problem with the certificate
            if ((sslPolicyErrors &
                SslPolicyErrors.RemoteCertificateChainErrors) == SslPolicyErrors.RemoteCertificateChainErrors)
            {
                foreach (X509ChainStatus item in chain.ChainStatus)
                {
                    if (item.Status != X509ChainStatusFlags.RevocationStatusUnknown &&
                        item.Status != X509ChainStatusFlags.OfflineRevocation)
                        break;

                    if (item.Status != X509ChainStatusFlags.NoError)
                    {
                        msg = msg + "\r\n    -" + item.StatusInformation;
                        acceptCertificate = false;
                    }
                }
            }
        }

        //If Validation failed, present message box
        if (acceptCertificate == false)
        {
            msg = msg + "\r\nDo you wish to override the security check?";
            //          if (MessageBox.Show(msg, "Security Alert: Server could not be validated",
            //                       MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1) == DialogResult.Yes)
            acceptCertificate = true;
        }

        return acceptCertificate;
    }

}

只需在執行Web請求之前調用該方法。

Certificates.Instance.GetCertificatesAutomatically();

如果我們能夠看到（代碼）您如何進行網絡請求，它還有助於診斷問題。